CVE-2026-23533
FreeRDP has heap-buffer-overflow in clear_decompress_residual_data
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 7.7EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
19 Jan 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Affected products
FreeRDP · FreeRDPWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L268-L281https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L336https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v